Is your feature request related to a problem? Please describe.
menu: Config -> extensions

The extensions list is called directly from github via https://raw.githubusercontent.com/FreshRSS/Extensions/master/extensions.json (in \app\Controllers\extensionController.php on line 45)

I am not so happy that always I call the extension config page a request is started to GitHub.

It costs resources (time, energy, privacy).

Describe the solution you’d like

• An option to decide: call GitHub and show me the list of available extensions or not
• cache the extensions.json, so that not every page load calls GitHub (f.e. cache it for 1 day)